Edge Retention/Rolling Test Stand

[subwoofer]

I have never been able to read Bladeforum's sharpening discussion. I banned myself very many years ago.

I read the whole thread very carefully. It not only reminded me why I banned myself, it reinforced the decision. 

I have 3 Benchmade 710s in M390, because 710s are my favorite inexpensive folders, and M390 is the best steel available. It's modern and expensive, and that's exactly how it performs. 

Obviously, any edge can role, but in my experience M390 is not prone to rolling, it's the opposite- chippy. Even Benchmade's.

This is the first one I acquired. I reprofiled it to about 9°/side and polished it (EdgePro), just to prove that it was possible, which was insane, especially with the recurve. It was an accomplishment I won't repeat. 

Although it did measure BESS 14 on the KN100 with plastic nuts...

LOL, forums are funny places, and I know many people who have had enough of certain forums, even to the extent of setting up their own....

If you are going to be 'controversial' you need to be as objective as possible and present the evidence. The edge tester is exactly one of those things where all you can do is say here are the results of my 'experiment' it seems to show this...

That is some lovely work on your re-profiling - how about putting that through the edge tester :-P

How is it that simple edges are so complicated? Perhaps this edge tester is going to need a standard 40 degree inclusive angle to allow us to compare, but then again it will be interesting to know how a blade steel preforms at 40 degrees, 35 degrees, 30 degrees, and other angles too.

Is there any chance it would even work for angles as large as scissor blades at around 78 degrees - would this even be of use as these blades are shearing? The extreme angle example is more to see if much larger inclusive angles on various tools would behave in a predictable way.

If the edge is diamond, ceramic or stone sharpened, has it been honed, and with what, will this affect the properties of the steel apex? For real working edges, the edge can be too sharp (thin); can we identify an ideal sharpness for the most stable edge for a given steel and edge angle? - I think we'll be at this for a while.